Dirtbag
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Purple petioles are a common trait in quite a few strains. The LP I know tests their hydro block nutrient concentrations and sends plant tissue samples into the lab every week to make sure that plants have what they need. And some strains still have it.
The pinstriping on the stem and brown blotches on the leaves are a sign of phosphorus def though. Could be from underfeeding, lockout, or just too much Ca either binding and forming insoluble compounds with P, or creating too much demand for it as JWM2 said.
I'd stop using the calmag and up the base nutrients a bit, to like 1.5-1.6 ec. Using calmag when you have P def will just exacerbate the problem.
The pinstriping on the stem and brown blotches on the leaves are a sign of phosphorus def though. Could be from underfeeding, lockout, or just too much Ca either binding and forming insoluble compounds with P, or creating too much demand for it as JWM2 said.
I'd stop using the calmag and up the base nutrients a bit, to like 1.5-1.6 ec. Using calmag when you have P def will just exacerbate the problem.